If you've been the recipient of an act of kindness and generosity you're more likely to pass it along, a new study suggests. In fact, it may only take a few people acting in kindness to influence dozens of others. A study that used a game in which people could donate money to others found that each person's kindness caused a domino effect that affected three others. Those three recipients then passed on that act if kindness to three others--nine in all. Researchers say it's exciting to see that...